Afterletters is available from BookThug.  There have been some nice reviews from Douglas Barbour, Nomadic Press, and Contemporary Verse 2. There's also a video interview, a q&a with Phil Hall, and a feature in Open Book Toronto about the book. 

From the reviews:

“Afterletters strikes a balance of Bachmann’s more reverent tone and Celan’s adamant questioning. Punctuation and form take on both Bachmannian and Celanian uses and shape.” — Michaela Mullin for Nomadic Press

“This is a stunning first book.” — Douglas Barbour for Eclectic Ruckus

“A vulnerable yet composed collection of work.” — Contemporary Verse 2

“Star-crossed lovers might be a familiar story, but in Kolewe’s hands, the story of poets Paul Celan and Ingeborg Bachmann takes on a life that is tense and lush, pulling a reader through the claustrophobic pressures of fate.” — Open Book Toronto