"To Heal the Broken Hearted"
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The Vatican website has a summary of his life. Other sources of information include the website of the Passionists of Mount Argus and the blog Laus Crucis has a number of links to material on St Charles in the sidebar.
"To Heal the Broken Hearted" is available to read online which is, in my view, an excellent idea - I am sure this will increase, rather than compete with sales of the book and, in any case, it will help to make St Charles better known. The printed book is available (£9.50 or 13.95 euros) from:
Ovada Books
Saint Mungo's Retreat
52 Parson Street
GLASGOW
G4 0RX
0141 552 5523