The book includes a short history of the Varangian's in Byzantine service including the early Russ and the later English exiles from Norman England. This is followed by sections on the Guard in service and equipment and weapons. Finally a helpful bibliography and of course the colour plates that are almost always the main selling point of an Osprey publication.
This is a link to pictures of my Comenenian Byzantine army including Varangian's in 28mm.
These figures are from the Gripping Beast range